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amardeep mishra
amardeep mishra
We do have a an active GaN transistor program as well and quite pleasantly the amplifier power specs are 80W each! Which is comparable to anywhere in the world.however as far as conventional GaAs based designed are concerned one single amp delivers 10W
amardeep mishra
amardeep mishra
But then again, we should be concerned with one TRMM right ? And 1 TRMM delivers 80W let's say if there are 100 such TRMMs are there in any indian radar which mean a peak power of 8kW
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Omega007
Yeah,got that.So if the TRMMs can be miniaturized to the point where say 200 or so of those could be squeezed into the Uttam's antenna array unit,then its peak power would go through the roofs!!

But then again,with such level of output,the heat management will also become a big problem,especially when we are talking about a light fighter with limited space inside the radome.
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Omega007
Great!!I wasn't aware that there had been active R&D programs going on to make GaN transistors in our country!!Thanks for the info.So have these matured to the point where they can be into the antenna arrays yet??And what about the cooling requirements??
amardeep mishra
amardeep mishra
In my opinion,yes,the GaN can be used depending on efficient cooling provisions.As for the cooling is concerned,i ran into a paper from LRDE that mentioned the specifications of cooling requirement for instance- ethylene glycol+water coolant -<3kW. The coolant required to effectively take out roughly 2.6kW of heat from the radar
amardeep mishra
amardeep mishra
So in any case,if that paper is to be believed then the max peak power of the radar cant exceed 2.6kW
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Omega007
Damn!!Looks like I underestimated the problem with heat dispersion.Anyway,thanks for your time.
by the way,one last thing - about the Uttam AESA radar,can you confirm whether the individual TRMMs have got 4 elemets or 8??
amardeep mishra
amardeep mishra
I think 8
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Omega007
Thanks.
knight11
knight11
So what is actual plan of the nos of T/R modules in Uttam 800 or 1000 modules
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Omega007
Can't say at this moment,but judging by the disproportionately large nose diameter of the LCA (660mm if I remember correctly compared to about 550 mm of Rafale)) ,1200 wouldn't be too unreasonable given the power-plant can generate enough power.
amardeep mishra
amardeep mishra
You see there are a lot of things that one need to take care of, I.e if the radar sports a fully DBF architecture or not.secondly the max peak power of our AESA is limited to 2.6kW! Multiply this with effective aperture will roughly tell you it's range
amardeep mishra
amardeep mishra
A fully digital beam forming architecture increases both hardware and software complexities many fold.for instance you need to have ADC at every antennae and algorithms to control every antennae
knight11
knight11
You are talking about the antenna, what about the computation of the data recieved, the digital beams could be digitally shaped and directed, but what about the computational power to analyse it provide to the screen.
knight11
knight11
Sorry words limitation problem, what about the computation of the image returns back. I mean radar with a2a will have some algorithm and now for SAR another, to identify air target one and for ground another library, but there are limitation of the computational power provided small engine to support that
amardeep mishra
amardeep mishra
You mean signal processing?
knight11
knight11
Well not sure about that because Signal processing in Embebded system is different that what i understand about the processing under x86, but any way the processing of the signal data returned back.
knight11
knight11
Sir, is there any way we can chat like IRC chat or FB chat, if you don't mind.
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Omega007
Well,that dude is on fb.
knight11
knight11
how should I be able to find him on fb. Post me the link pls

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